David WE Roberts wrote:

"Nick Holmes" wrote in message
...
snip
Can this discharge be connected to an external cast iron soil pipe
(which in our 1906 build carries both bath(shower) outflow and foul
water from 2nd floor toilet (incidentally Cambridge's
edwardian/victorian houses have combined surface and foul water
connections to mains drainage which would not be permitted in a modern
property)).
snip

I am a bit puzzled by this - when I put a second bathroom in my 1930s
house around 2001/2 I had to run a new soil pipe to an existing manhole
and I fed both grey and black water into the same stack.

Building control were perfectly happy with this.

Is this a recent change, or does it not apply when working with older
properties?

Cheers

Dave R
More a function of your local water authority really.

But he was talking 'white' water, Rain collection.

All used water must be treated, black, brown or grey.

All rainwater ideally should end up in the subsoil or river system.